Improvement in compound high and low pressure steam-pumps



2 Sheets--Sheet 2.

, A. 1. L. LORETZ. Compound High and Low Pressure Steam-Pumps.

N0. 139,071. Patented May 20,1873.

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ivrrjnn STATES- PA'rniv'r OFFICE.

ARTHUR J. L. LORETZ, OF BROOKLYN, NEW YORK.

IMPROVEMENT IN COMPOUND HIGH AND LOW PRESSURE STEAM-PUMPS.

Specification forming part of Letters Patent No. 139,071, dated May 20, 1873; application filed October 9, 1872.

To all whom it may concern:

Be it known that I, ARTHUR J. L. Lonrz, of Brooklyn, in the county of Kings and State of New York, have invented a Compound High and Low Pressure Steam-Pump, of which the following is a specification:

My invention consists of two cylinders, A and B, Figure 2, bolted by flanges D1 D2 to each end of cylinder O, said cylinder C forming the water-valve chests, and being divided into two compartments, Figs. l and 2, E1 E2, each provided with four metallic disk-valves faced with rubber and working loose on spindles, compartment E1containing the suctionvalves; also provided with nozzles F1 and F2, to which the proper suction and deliveryvalves are attached. Each cylinder, A and B, Fig. 2, has a piston, G1 and G2, the two being connected together by the tubular piece H, thus uniting the two pistons and forming, with the cylinders A and B and water-chest (l, four compartments or chambers, viz: L1 L2 M1 M2, two more, N1 and N2, being forlned inside the tubular piece H by the steam-chests l1 l2, which is held in position by the tubes .l1 and J2, through which the steam enters the chest, each tube being made fast to the heads of cylinders A and B-the tube J2 being bolted to a wrought iron plate, K, which is bolted to head of cylinder B, making an expansion joint, thus allowing for the difference of expansion between the large cylinder and tubes. The steam-chest is made in two pieces, I1 and l2, in order to enter the steam-valve O. The steam-chest has also two grooves, one in each half, P1 P2, containing packing-rings, acted upon by the steam from the chest, thus packing the interior of tubular piece H, the outside being packed by spring-rings, or rings acted upon by the pressure of the water, set in the partition Q of the water-valve-chest cylinder C.

Thus, it will be seen that there are six chambers, viz: N1 and N2 being the highpressure cylinders, M1 and M2 the low-pressure-cylinder chambers, and L1 and L2 the vacuum and and water cylinder chambers, the latter connecting directly with the watervalve chest.

The operation of the pump is thus: The steam, entering through either of the tubes J1 or J2, but now represented in Fig. 2 entering J1, enters and fills the interior of the steam-chest l1 l2. The main steam-valve O having `previously been thrown open, the steam enters through the valve-openings, as represented by the arrows, into the high-pressure steam-chamber N1. Now, the steamchest-being held fast by the tubes J1 and J2, the steam will move the whole combination of piston G1 G2 and H forward; the steam, also pressing against the back of the valve R1, shows itin its forward position, keeping the steam from escaping through the passage S1- of piston G1 into the low-pressure-cylinder chamber, the valve R1 also opening the pas sage T1 on the inside of low-pressure cylinder n', allowing'the vapor that has been used in the previous stroke to escape through T1, pass the annular water-valve U1, which is open and Abears against its guard, V, and then passing into the water-valve chest. The vapor, being below the atmospheric pressure, the atmosphere will force the water into the water-cylinder L1, entering first the nozzle F1, opening the section-valves, and then entering the cylinder L1. Now, should the water enter with too great a velocity into the cylinder'L1, the

annular water-valve U1 will close the iassa e T1, keeping the water from. entering the lowpressure cylinder-chamber M1; also packing the piston G1 by acting upon the packing-rings in the valve U1. The valve being closed and not allowing the vapor to pass into the water, and the space in the low-pressure cylinder, continually decreasing, the vapor being compressed, will again create a pressure, which will immediately open the valve U1 again, allowing the steam to mix in with the water.

The part of the valve R1 in the high-pressure-cylinder, around the tube J1, is packed by a ring acted upon by the pressure of the steam in cylinder N1.

Now, while the aforesaid operation is taking place in cylinder A, the high-pressure steam, which was previously in cylinderchamber N2, now passes through the passages S2, of piston G2, into the low-pressure-cylinder chamber M2, and acting upon piston G2, a port being in equilibrium with N2, the valve R2 closing the passage T2, the valve being acted upon by the springs which, in the previous stroke, were kept compressed by the pressure of the steam acting upon the position of the valve in the high-pressure-cylinder chamber, as is just the case now in cylinder A-the friction of` the valve R2, when iitting around the tube J2, being reduced by the pressure of the steam being taken od' the the packin g-rin gs in consequence of the highpressure cylinder N2 being thrown into equilibrium with the low-pressure cylinder M2. The annular water-valve, which is faced with rubber, closing the passage T2 of the piston G2, -being acted upon by the atmospheric pressure and the height of the column of water to which it is forced, the piston G2 being packed by the water-pressure acting on the packing-rings in the water-valves U. Now, when the pistons approach the ends of their stroke, the face X of the valve R2, in the cylinderchamber N2, will strike the projecting tappets Y of the steam-valve O, that valve being acted upon by the pressure of the steam on the outside and there being almost a perfect vacuum on the outside in cylinder N2 by the entire expansion of the steam, the valve R2 will then, of course, move toward its seat in preference to the opening of the valve O, thereby closing the ilan ges S2, the blow ot' closing being somewhat checked by the compressing of the spring acting against thc valve in the cylinder M2. The valve R2 being seated on the face of piston G2, we then have the entire pressure of steam in cylinder-chamber N1 to open the valve O on the side of the cylinder N2. Now, as soon as the steam enters the cylinder N2, the passage S2 having previously been closed, the pressure ot' steam in cylinder N2 will become equal to that in the steamchest-that is, before the piston G2 begins to move-thus placing the one-halt', W2, of the valve 0 in equilibrium. Again, while the valve R2 has opened the steam-valve O by striking the tappets Y, the valve R2, in cylinder M1, has struck the cylinder-head of A- with its face Z, opening the passage S2 of piston G1, the steam in cylinder N1 rushing into the low-pressure cylinder M1. The pressure being thus diminished, the side VW ot' valve O will be thrown out of equilibrium, causing it to ily over and close the-steam-openings ot' cylinder N1 and opening those ot' cylinder N2. The steam being shut oi'f from cylinder N1, and the valve R1 having been opened a little by the aforesaid operation, and the pressure which kept the valve R1 on the seat of piston G1 being almost reduced to an equilibrium, the spring, acting upon the valve in cylinder M1, will throw the valve entirely back, closing the passage T1, keeping the expanding steam from going through into the water, the friction of the valve R1 around the tube J1 being also reduced by not being acted upon by the steam, there being an equilibrium of steam in the cylinders N1 and M1. When the pressure of the expanding steam falls below that of the atmosphere, or that of the height of the column of Water that is being pumped, then the annular Water-valve U1 will keep the Water from entering the cylinder M1 through the passage T1, also packing the piston G1, with the Water actin g upon the packingrings in its periphery.

Having explained my invention, what I claim and desire to secure by Letters Patent, 1s-

l. The arrangement of the pistons G1 G2, in their cylinders A and B, connected by tubular piece H, the partition Q of the vacuum and pump chamber G, the steam-chest I1 I2, and chambers N1 N2, M1 M2, and L1 L2, all constructed to operate substantially as and for the purpose set forth.

2. The combination of the double-valve R, its packing and spring-rings, the tubes J1J2, with the cylinder N1 N2 and M1 M2, all arranged substantially as shown and for the purpose specified.

3. The combination of the annular-valve U, provided with packing-rings, With the doublevalve R, arranged substantially as shown, and for the purpose described.

4. The combination of the steam-chests I1 12, having grooves F1 F2, and packing, with the double valve O, tappets Y, connecting tube H, tubes J1 J2, secured to cylinders A and B, and sitable openings, substantially as and for the purpose herein described.

5. The cylinders A B, bolted with tlanges D1 D2 to the chamber C containing the suction and delivery rollers, in combination with the pistons` G1 G2, passages S T, tube H, double valve R, annular valve U, steam-chest I, valve O, and tubes J, all arranged substantially as and for the purpose specified.

ARTHUR J. L. LORETZ.

Witnesses: 4

WM. BURDoN, J. A. COLEY. 

